Rotary stud fastener installation



Jan. 25, 1944.

H. J; MURPHY ROTARY STUD FASTENER INSTALLATION 7 Filed Julyl6, 1943 Fig.4

Inzvenior'. ibward/ J Mar I 3! Patented Jan. 25, 1944 UNITED Fit nor-any srruo FASTENER msrapmrron Howard J. Murphy, Greenwood, Masa, assignor to United-Carr Fastener Corporation, Cambridge, Mass a corporation of Massachusetts Application July 16, 1942, Serial No. 451,126

The present invention relates to fastener secured installations as well as the rotary stud fastener therefor and aims generally to improve and simplify the construction of the installation as well as. the rotary stud fastener.

Heretofore, such fastener secured installations and rotary stud fastener used for securing two sheet metal plates together, as for example airplane cowling, have required a separate female fastener member attached to the inner face of the supporting panel. This has required punchingthe supporting panel and fastening the female fastening member thereto as by rivets prior to assembly of the sheets and fastener.

Furthermore, the rotary stud member, which frequently has been a specially milled or a screw machine made part, was usually rotatably fitted to the supported panel prior to assembly and frequently required-special tools or machines for effecting such fitting.

My invention aims to improve existing installations of this type by eliminating the necessity of a separately formed and attached female fastening member, thus eliminating much of the expense and time required for constructing the installation. I v

A further aim and object of the invention is to improve the construction of the rotary stud member to eliminate slow and expensive machining operations and the necessity of special tools or machinery for mounting the stud member in the supported part.

Illustrative of my invention, reference is made to the accompanying drawing wherein two embodiments of the invention are shown, and

wherein Fig. 1 is a plan viewed from the inner member showing the preferred relative position of the parts prior to the application of the stud fastener;

Fig. 2 is a similar view with the stud shown inserted in the inner member but not locked thereto;

Fig. 3 is a similar view with the stud in locked position;.

Fig. 4 is a sectional view taken on the line 4-4 of Fig. 2 with the parts of the fastening in their unlocked position; V

Fig. 5 is a sectional view taken on theline 5-5 of Fig. 3 with the parts of the fastening locked;

Fig. 6 is a similar view of a modified form of fastening;

'Fig. 7 is an edge elevation of a stud member according to one form of'the invention; and

Fig. 8 is a side elevation thereof.

Referring to the drawing, the improved fastenet of my invention is primarily, though not necessarily, designed for securing two metal sheets, such as cowling sheets, in fiush-tight relationship. Such sheets, for convenience, are

herein designated as a supporting part I and a supported part 2, though it will be understood that the part 2 may be the support and the part I the supported part.

The supported part 2 is'preferably provided-with a stud-receiving recess-3 formed in any suitable manner, as by shaping the material of'the'supported member 2 in an annular boss 4, thebase of which is provided with an elongated aperture 5, adapted to receive the shank of a stud member rotatablymounted therein.

The rotary stud member, according to the invention, is of novel constructionandis preferably formed of a heat-treated'ribbon'of steel bent to provide an elongated flattened looped base l0 the extremity of the ribbon may be parallel to the web portions l2, forming a reduced shank "5.5

The stud member thus formed is characterized in that it has a base with a relatively rigid web portion extending therefrom and a head comprising laterally yielding divergent cams and convergent shoulders connected to the web portions shoulders l5, preferably is substantially greater than its thickness and is slighty greater than the length of the slot 5, so that the stud may be loosely retained in the slot 5 of the member 2. I nsertion of the stud in the slotis, however, readily accomplished due to the lateral resiliency of the cams l4.

The base 10 of the stud may, if desired, be encased within a cap member I! and securely fastened thereto, as shown in Fig. '7, and the cap may be provided with a transverse groove I8 fitted within a groove IQ of the base ID for the reception of a bladed tool, as for example a screw driver, for turning the stud in the member 2.

Furthermore, the shouldersi'li as well as the v through an arc of approximately 90 and thus secure the parts I and 2 together in locked relationship.

The supporting member I is preferably formed with a recess 20 to receive the boss 4 of the memher 2 so that the major portions of the plates or members I and 2 may be in flush-tight relationship.

In cases where the supporting member I is'a relatively'flat sheet or plate, the recess 20 may be formed by shaping the material of the sheet in an ainnular boss 2| of sufllcient size to receive the boss I, the base of which may be provided withan elongated slot 22 of suflicient length to receive the cam portions" ll of the rotary stud member. The width of the slot is substantially equaltoor less than the width of the stud shank I6. Portions of the metal of the support I cut' out to form the slot 22 may be bent angularly to the base of the boss 2I to provide spaced stop members.23 on opposite sides of the slot 2I to prevent rotation of the stud beyond its locked position.-

In certain cases the support may be in the form of a channelled member I, as illustrated in Fig. 6, in which case the channelportion provides means to receive the boss 4. In such case the elongated slot 22 is formed in the web of the channel. 1

The slots 5 and 22 in the members 2'and I,

respectively, may be so arranged as to be symmetrical when the par-ts I and 2 are in assembled relation, but preferably these elongated slots are {arranged with-their longitudinal axes at rightwangles to each other, so that when the 'plates::are' assembled a restricted rectangular opening is provide :-This; provides amore see cure interloclg between the, members I and 2.

My improved fastener has the',' advantageor simplicity of construction, eliminatin'g'fthe necesesity oila separat'ijemale fastenihgmeniber, 1, 1- .g,

ally'employed, which/must be attached to the rear face-{of thamppon by rivetsfand thelikez i Furthermore, the construction oifthe stud meme,

her is such? that it can be readily formed on bend-'1 ing machines much more quickly tharrother studs which require screw machine or milling operations.

Although I have illustrated and described preferred embodiments of my invention, glf do not wish to beflimitedthereby because-thescope of my invention is best defined In a rotary stud fastener securedinstallation, in a combination, a stud-carrying memberhav-u ing an aperture therein, a stud member rotat ably mounted in said aperture and formed of ,a ribbon of metal bent to provide an elongated looped base, relatively rigid axial web-portions extending from said base through-said aperture, each of said web portions terminating in a nose portion merging into divergent cam portions, inwardly extending shoulder portions connected to each-diverging cam portion, said shoulders being obliquely inclined with reference to the edge surface of said divergent cam portions, and terminal end portions extending from the inner ends of said shoulders and cooperating with said web portions to provide the shank of said stud.

HOWARD J. URPHY.

y theiollowingv 'clairn. v 1; 

